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You can convert SBD to Steem in the Market. Do you know how to do this? One of the reasons for it requiring steem is that by sending SBD you are requesting an upvote.

I know but STEEM would cost more know?

You only want to use STEEM if you want to do a Sponsored Curation for 3 STEEM, otherwise, you can bid using SBD ($0.10+).

Coin Marketplace

STEEM 0.17
TRX 0.15
JST 0.028
BTC 60429.37
ETH 2327.68
USDT 1.00
SBD 2.52